Patents by Inventor Michael Richard Leonard

Michael Richard Leonard has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Power supply with reduced second harmonic
    Patent number: 6141227
    Abstract: A power supply receives an alternating current which is converted by a fixed rectifier to a direct current. The direct current is converted by an inverter to an alternating current of a desired frequency and provided to a parallel resonant fixed load circuit such as a work-coil of an induction heater. The power supply includes a device for reducing amplitude of at least a second harmonic of a fundamental frequency of the current output by the inverter so that a filter connected to the load circuit can have a roll-off frequency close to the design frequency of the load circuit.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: October 31, 2000
    Assignee: Cheltenham Induction Heating Limited of Phoenix Works
    Inventors: Haroon Karamat Sheikh, Philip Lipscomb, Michael Richard Leonard